CHEMISTRY OF PYRROLE PIGMENTS .32. DIAGNOSTIC-VALUE OF C-13-NMR-SPECTROSCOPY OF DIASTEREOMERIC BILATRIENES-ABC

All13C-NMR signals of (Z, Z, Z)-Aetiobiliverdin-IV-γ could be assigned to the corresponding positions of the molecular framework using double resonance experiments. In the (Z, Z, E)-isomer the methine carbon signals of the terminal moieties are shifted in a dramatically different manner. Thus they represent an ideal tool for labelling experiments aiming at an experimental support of the photoisomerization hypothesis of the photoreaction of phytochrome. © 1979 Springer-Verlag.